Process for the manufacture of brown wood-pulp and half-cellulose from resinous kinds of wood.



STAEd PATENT @Fllilltl li- J'ACOUB AKTSCHO'URIN, F AKTSCHOUBIN-TUPIK,RUSSIA.

PROCESS FOR THE MANUFACTURE OF BROWN WOOD-PULP AND HALF-CELLULOSE FROMRESINOUS KINDS OF WOOD.

messes.

Ito Drawing.

To all whom it may concern:

Be-1t known that I, JAcoUB AKTSGHOURIN,

, residing at Aktschourin-Tupik, in the E111- than those kinds whichcontain less pire of Russia, have invented certain new and usefulImprovements in Processes for the Manufacture of Brown \Vood-Pulp andHalf-Cellulose 'from Resinous Kinds of food, of which the following is aspecification.

In the Working up of various kinds of Wood into cellulose a concentratedsolution ofalkali is allowed to act thereon usually at high temperature.This process could also be employed for the manufacture of halfcellulose from resinous kinds of Wood, but the use of these kinds ofwood is confronted with difliculties, although the quality of thecellular tissue thereof is by no means less than the quality of thenonresinous Woods, and the process is even cheaper according to localconditions. The treatment of the Wood of resinous kind of treesrequires, as is Well known, more li 3 because an excessive quantity ofalkali is used to convert the resin into a soluble condition or into theso-called resin soap, and in addition the solution obtained in thereaction, and which is a mixture of resin soap and decompositionproducts of the incrusting substances by the alkali, possesses no valueas a lay-product. If on the contrary a dilute solution of alkali beallowed to act on resinous Wood, even under pressure, but not at a hightemperature, the alkali does not dissolve the incrusting substances, butsaponifies the resins and separates the resin partially in the form ofan emulsion. After being used therefore the alkaline solution containson the one hand resin soap and resin, which after cooling can beseparated by filtration and impart a value to the by-product, and on theother hand the Wood pulp is freed from resin and can be subjected to theaction of the filtered solution at a high pressure and a hightemperature for the purposeof decomposing the ins crusting substances.

The present invention enables the alkali which serves for the treatmentof the resin product to be completely utilized, and the Patented Jan.25, 19161.

Application filed December 18, 1911. Serial No. 666,554.

It must be noted, that it has hitherto been quite impossible, on account"of the incompleteness of the processes which have been proposed, tomanufacture a brown wood pulp or half cellulose from trees rich inresin, of which latter the pine possesses the greatest value on accountof its very wide occurrence.

The manufacture of half cellulose according. to the present processconsists as hereinafter described of the following consecutiveoperations. Firstly the pine Wood logs are disintegrated in machines.such as are universallv used in the production of cellulose for thispurpose. Secondly the disintegrated wood pulp is treated with alkaliunder pressure of a few atmospheres, but at a temperature below 100degrees C., the liquid being kept in constant circulation through theWood pulp or the like under treatment, by means of injectors, for thepurpose of saponifying the resinous substances in the wood pulp.Thirdly, the mass is cooled down, the solution drawn off and thenpressed out in centrifugal machines, filter presses or the. like.Fourthly, after the resin soap and the resin have separated onthefilter, the filtered off solution is employed for the further treatmentof the Wood pulp obtained and is used together With the action of steamat a pressure of 5 to 6 atmospheres and at a corresponding temperature,in which treatment the alkali now acts upon the incl-listing substancesof the Wood pulp, decomposes them and converts them into half cellulose.

The characteristic peculiarity of the present process consists in thefact, that for the Working up of resinous Woods into half cellulose thedisintegrated wood pulp is first subjected to the action of a dilute solution of alkali having a density of approximately 4 to 7 Be. underpressure and at a comparatively low temperature up to 100 degrees C.Under these conditions the alkali does not act upon the incrustingsubstances, but yields simultaneously a mixture of resin (colophony)resin soap and alkali. After the resin and the resin tar soap separated,the Wood pulp, freed is also in its turn subjected to of the filtered 05solution of alhe purpose of decomposing the kali, 2G3? substances whichincrust the WO'UCl cells.

which decomposition takes place under high pressure and at acorresponding temperature.

I claim: I

1. A process for making wood-pulp from resinous wood, which consists ofdiminuting the wood and subjecting the same under pressure to the actionof an alkalinous lye having a density of approximately 4 to 7 B., saidlye being not sufiiciently concentrated to decompose the incrustingsubstances, and of treating the material after this step with alkalinouslye under coaction of steam.

2. A process for manufacturing woodpulp from resinous wood, consistingof diminuting the wood, treating-the same with an alkalinous lye havinga density of approximately l" to 7 Be. at a temperature below 100,drawing off the solution, removing the sap'onified resin and free resinfrom the solution and subjecting the wood again to the action of thesame solution.

3. A process for the manufacture of wood-pulp from resinous wood, whichconsists of diminuting the wood, treating the same with an alkalinouslye having a density of approximately 4 to 7 Be. at a pressure of 2-3-4atmospheres, separating the resins extracted by said solution from thesolution and subjecting the wood to the ac tion of the same solution ata pressure of 5-6 atmospheres under coaction of steam.

4. A process for the manufacture of wood-pulp from resinous wood, whichconsists in diminuting the wood, subjecting the same to the treatment ofa diluted alkalinous lye having a density of approximately 4 to 7 B6. ata low temperature, extracting the resins after this step from thesolution by means of filtration and subjecting the wood to the action ofthe filtered solution at a pressure of 56 atmospheres under coaction ofsteam.

The herein described steps in a process for making wood pulp fromresinous wood, which consists in reducing the wood to a,

finely divided condition, treating the wood at comparatively a lowtemperature and low pressure with dilute alkali solution capable ofdissolving the .resinous substances, but not the incrustipg substancesof the Wood pulp and drawing off the solution containing theresinous'substances from the mass. I

6. The herein described steps in a process for making wood pulp fromresinous wood, which consists in reducing the wood to a finely dividedcondition, treating the wood at comparatively a low temperature-"and lowpressure with dilute alkali solution capable of dissolving only theresinous substances, drawing off the solution containing the resnoussubstances from the mass, filtering out 8. The herein described stepsina process .of making wood pulp from resinous wood,

which consists in reducing the wood to a finely divided condition,treating the wood at a comparatively low temperature and low pressurewith dilute'caustic alkali solution having a density of substantially 4to 7 B. and capable of dissolving onlythe resinous substance from themass, filtering out the resinous matter from the caustic alkali solutionand again subjecting the mass to treatment with the alkali filtrate atan increased pressure and at an increased temperature.

Signed at St. Petersburg, 20th day of September, 1911..

J ACOUB AKTSCHOURIN.

1 Russia, this In the presence of DANIEL GARDNER, AUG. MIGI-IIS,

